Ward Hill Lamon,
The Life of Abraham Lincoln, from His Birth to His Inauguration as President
“ The principal difficulties we encountered in descending the river were from the drifted timber, which obstructions all know are not difficult to be removed. Knowing almost precisely the height of water at that time, I believe I am safe in saying that it has as often been higher as lower since. From this view of the subject, it appears that my calculations with regard to the navigation of the Sangamon cannot but be founded in reason; but, whatever may be its natural advantages, certain it is, that it never can be practically useful to any great extent, without being greatly improved by art. ”
